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IsoPlane and PIXIS used to explore the optical properties of gold nanoparticle arrays

October 28, 2014

Princeton Instruments congratulates Prof. Jing Zhao of the University of Connecticut on the recent publication of “Blue Shifted Narrow Localized Surface Plasmon Resonance from Dipole Coupling in Gold Nanoparticles Random Arrays” (J. Phys. Chem. C, 2014, DOI: 10.1021/jp508181g).

Dr. Zhao and her co-workers used a Princeton Instruments IsoPlane SCT-320 aberration-corrected spectrograph in conjunction with a Pixis:1024BR deep cooled CCD camera to explore the optical properties of gold nanoparticle arrays. In these self-assembled nanostructures, long-range dipole coupling is shown to profoundly influence the peak wavelength and width of the surface plasmon resonance peak. Figure 1, for example, shows light scattering spectra of identical gold nanoparticles deposited on a surface, isolated as single particles, or in bulk solution. Highly specific methods for functionalizing gold NPs to bind to different molecules are now available. Hence, the sensitivity of the optical properties to the local dielectric environment, as modified by the presence of bound or adsorbed target molecules, points toward the use of functionalized gold NP arrays as exquisitely sensitive probes for chemical sensing by optical imaging and spectroscopy.

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